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+Q: Your compiler supplies a der_encode() procedure. How do I encode BER?
+A:
+ The DER (and CER) are stricter subsets of a more generic BER encoding
+ method. If you encode data with DER or CER, all BER-conformant decoders
+ will easily understand that. Hence, to encode data in the BER format,
+ simply use the DER encoder, der_encode().
+
+ See also: ISO/IEC 8825-1 / X.690:
+ "ASN.1 encoding rules: Specification of
+ Basic Encoding Rules (BER),
+ Canonical Encoding Rules (CER) and
+ Distinguished Encoding Rules (DER)"
+